Printing: Move some printing code out of pdf/ and into printing/.

printing/pdf_transform_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/pdf_transform.h"
+
+#include "printing/units.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace printing {
+
+namespace {
+
+const float kDefaultWidth = 8.5 * kPointsPerInch;
+const float kDefaultHeight = 11.0 * kPointsPerInch;
+const float kDefaultRatio = kDefaultWidth / kDefaultHeight;
+const double kTolerance = 0.0001;
+
+void ExpectDefaultPortraitBox(const ClipBox& box) {
+  EXPECT_FLOAT_EQ(0, box.left);
+  EXPECT_FLOAT_EQ(kDefaultWidth, box.right);
+  EXPECT_FLOAT_EQ(kDefaultHeight, box.top);
+  EXPECT_FLOAT_EQ(0, box.bottom);
+}
+
+void ExpectDefaultLandscapeBox(const ClipBox& box) {
+  EXPECT_FLOAT_EQ(0, box.left);
+  EXPECT_FLOAT_EQ(kDefaultHeight, box.right);
+  EXPECT_FLOAT_EQ(kDefaultWidth, box.top);
+  EXPECT_FLOAT_EQ(0, box.bottom);
+}
+
+void ExpectBoxesAreEqual(const ClipBox& expected, const ClipBox& actual) {
+  EXPECT_FLOAT_EQ(expected.left, actual.left);
+  EXPECT_FLOAT_EQ(expected.right, actual.right);
+  EXPECT_FLOAT_EQ(expected.top, actual.top);
+  EXPECT_FLOAT_EQ(expected.bottom, actual.bottom);
+}
+
+void InitializeBoxToInvalidValues(ClipBox* box) {
+  box->left = box->right = box->top = box->bottom = -1;
+}
+
+void InitializeBoxToDefaultPortraitValues(ClipBox* box) {
+  box->left = 0;
+  box->right = kDefaultWidth;
+  box->top = kDefaultHeight;
+  box->bottom = 0;
+}
+
+void InitializeBoxToDefaultLandscapeValue(ClipBox* box) {
+  box->left = 0;
+  box->right = kDefaultHeight;
+  box->top = kDefaultWidth;
+  box->bottom = 0;
+}
+
+}  // namespace
+
+TEST(PdfTransformTest, CalculateScaleFactor) {
+  gfx::Rect rect(kDefaultWidth, kDefaultHeight);
+  double scale;
+
+  // 1:1
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, false);
+  EXPECT_NEAR(1, scale, kTolerance);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, true);
+  EXPECT_NEAR(kDefaultRatio, scale, kTolerance);
+
+  // 1:2
+  rect = gfx::Rect(kDefaultWidth / 2, kDefaultHeight / 2);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, false);
+  EXPECT_NEAR(0.5, scale, kTolerance);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, true);
+  EXPECT_NEAR(kDefaultRatio / 2, scale, kTolerance);
+
+  // 3:1
+  rect = gfx::Rect(kDefaultWidth * 3, kDefaultHeight * 3);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, false);
+  EXPECT_NEAR(3, scale, kTolerance);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, true);
+  EXPECT_NEAR(kDefaultRatio * 3, scale, kTolerance);
+
+  // 3:1, rotated.
+  rect = gfx::Rect(kDefaultHeight * 3, kDefaultWidth * 3);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, false);
+  EXPECT_NEAR(kDefaultRatio * 3, scale, kTolerance);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, true);
+  EXPECT_NEAR(3, scale, kTolerance);
+
+  // Odd size
+  rect = gfx::Rect(10, 1000);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, false);
+  EXPECT_NEAR(0.01634, scale, kTolerance);
+  scale = CalculateScaleFactor(rect, kDefaultWidth, kDefaultHeight, true);
+  EXPECT_NEAR(0.01263, scale, kTolerance);
+}
+
+TEST(PdfTransformTest, SetDefaultClipBox) {
+  ClipBox box;
+
+  SetDefaultClipBox(false, &box);
+  ExpectDefaultPortraitBox(box);
+
+  SetDefaultClipBox(true, &box);
+  ExpectDefaultLandscapeBox(box);
+}
+
+TEST(PdfTransformTest, CalculateMediaBoxAndCropBox) {
+  ClipBox media_box;
+  ClipBox crop_box;
+
+  // Assume both boxes are there.
+  InitializeBoxToDefaultPortraitValues(&media_box);
+  InitializeBoxToDefaultLandscapeValue(&crop_box);
+  CalculateMediaBoxAndCropBox(true, true, true, &media_box, &crop_box);
+  ExpectDefaultPortraitBox(media_box);
+  ExpectDefaultLandscapeBox(crop_box);
+
+  // Assume both boxes are missing.
+  InitializeBoxToInvalidValues(&media_box);
+  InitializeBoxToInvalidValues(&crop_box);
+  CalculateMediaBoxAndCropBox(false, false, false, &media_box, &crop_box);
+  ExpectDefaultPortraitBox(media_box);
+  ExpectDefaultPortraitBox(crop_box);
+  CalculateMediaBoxAndCropBox(true, false, false, &media_box, &crop_box);
+  ExpectDefaultLandscapeBox(media_box);
+  ExpectDefaultLandscapeBox(crop_box);
+
+  // Assume crop box is missing.
+  ClipBox expected_box;
+  expected_box.left = 0;
+  expected_box.right = 42;
+  expected_box.top = 420;
+  expected_box.bottom = 0;
+  media_box = expected_box;
+  InitializeBoxToInvalidValues(&crop_box);
+  CalculateMediaBoxAndCropBox(false, true, false, &media_box, &crop_box);
+  ExpectBoxesAreEqual(expected_box, media_box);
+  ExpectBoxesAreEqual(expected_box, crop_box);
+
+  // Assume media box is missing.
+  InitializeBoxToInvalidValues(&media_box);
+  CalculateMediaBoxAndCropBox(false, false, true, &media_box, &crop_box);
+  ExpectBoxesAreEqual(expected_box, media_box);
+  ExpectBoxesAreEqual(expected_box, crop_box);
+}
+
+TEST(PdfTransformTest, CalculateClipBoxBoundary) {
+  ClipBox media_box;
+  ClipBox crop_box;
+  ClipBox result;
+
+  // media box and crop box are the same.
+  InitializeBoxToDefaultPortraitValues(&media_box);
+  InitializeBoxToDefaultPortraitValues(&crop_box);
+  result = CalculateClipBoxBoundary(media_box, crop_box);
+  ExpectDefaultPortraitBox(result);
+
+  // media box is portrait and crop box is landscape.
+  InitializeBoxToDefaultLandscapeValue(&crop_box);
+  result = CalculateClipBoxBoundary(media_box, crop_box);
+  EXPECT_FLOAT_EQ(0, result.left);
+  EXPECT_FLOAT_EQ(kDefaultWidth, result.right);
+  EXPECT_FLOAT_EQ(kDefaultWidth, result.top);
+  EXPECT_FLOAT_EQ(0, result.bottom);
+
+  // crop box is smaller than media box.
+  crop_box.left = 0;
+  crop_box.right = 100;
+  crop_box.bottom = 0;
+  crop_box.top = 200;
+  result = CalculateClipBoxBoundary(media_box, crop_box);
+  EXPECT_FLOAT_EQ(0, result.left);
+  EXPECT_FLOAT_EQ(100, result.right);
+  EXPECT_FLOAT_EQ(200, result.top);
+  EXPECT_FLOAT_EQ(0, result.bottom);
+
+  // crop box is smaller than the media box in one dimension and longer in the
+  // other.
+  crop_box.left = 0;
+  crop_box.right = 100;
+  crop_box.bottom = 0;
+  crop_box.top = 2000;
+  result = CalculateClipBoxBoundary(media_box, crop_box);
+  EXPECT_FLOAT_EQ(0, result.left);
+  EXPECT_FLOAT_EQ(100, result.right);
+  EXPECT_FLOAT_EQ(kDefaultHeight, result.top);
+  EXPECT_FLOAT_EQ(0, result.bottom);
+}
+
+TEST(PdfTransformTest, CalculateScaledClipBoxOffset) {
+  gfx::Rect rect(kDefaultWidth, kDefaultHeight);
+  ClipBox clip_box;
+  double offset_x;
+  double offset_y;
+
+  // |rect| and |clip_box| are the same size.
+  InitializeBoxToDefaultPortraitValues(&clip_box);
+  CalculateScaledClipBoxOffset(rect, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+
+  // |rect| is larger than |clip_box|.
+  clip_box.top /= 2;
+  clip_box.right /= 4;
+  CalculateScaledClipBoxOffset(rect, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(229.5, offset_x);
+  EXPECT_DOUBLE_EQ(198, offset_y);
+}
+
+TEST(PdfTransformTest, CalculateNonScaledClipBoxOffset) {
+  int page_width = kDefaultWidth;
+  int page_height = kDefaultHeight;
+  gfx::Rect rect(kDefaultWidth, kDefaultHeight);
+  ClipBox clip_box;
+  double offset_x;
+  double offset_y;
+
+  // |rect|, page size and |clip_box| are the same.
+  InitializeBoxToDefaultPortraitValues(&clip_box);
+  CalculateNonScaledClipBoxOffset(
+      rect, 0, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 1, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 2, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 3, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(180, offset_x);
+  EXPECT_DOUBLE_EQ(-180, offset_y);
+
+  // Smaller |clip_box|.
+  clip_box.top /= 4;
+  clip_box.right /= 2;
+  CalculateNonScaledClipBoxOffset(
+      rect, 0, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(594, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 1, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 2, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(306, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 3, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(486, offset_x);
+  EXPECT_DOUBLE_EQ(414, offset_y);
+
+  // Larger page size.
+  InitializeBoxToDefaultPortraitValues(&clip_box);
+  page_width += 10;
+  page_height += 20;
+  CalculateNonScaledClipBoxOffset(
+      rect, 0, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(20, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 1, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(0, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 2, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(10, offset_x);
+  EXPECT_DOUBLE_EQ(0, offset_y);
+  CalculateNonScaledClipBoxOffset(
+      rect, 3, page_width, page_height, clip_box, &offset_x, &offset_y);
+  EXPECT_DOUBLE_EQ(200, offset_x);
+  EXPECT_DOUBLE_EQ(-170, offset_y);
+}
+
+}  // namespace printing